Has Bruce addressed his substance abuse issues on the show? He has no obligation to do so, but I just wondered if he has opened up about it at all.
He has, but never all in one place or in one particular episode. They talk about it a fair bit in the infamous "Why Was Bruce Fired" episode, but as peachchaos said, he alludes to his substance use throughout the history of the show when it comes up during the course of conversation more than anything. He actually talked about it more during an interview he did with the Two Man Powertrip of Wrestling podcast a while back. Actually, he did that interview in response to Russo. After Prichard did his initial podcast on Russo, Russo replied in a podcast of his own and claimed that Prichard's memory couldn't be trusted because he was a pill user and a drunk.
At different times throughout the course of his show, Prichard has confessed to doing cocaine, smoking a lot of pot and popping a lot of pills. He claims that despite rumors to the contrary, he never went to rehab to address the issue. He claimed he has no problem with the concept of rehab but that he never felt he was out of control enough to need to go. He has claimed he no longer does coke or pills and rarely smokes pot, but he still drinks a fair bit of beer. If you read between the lines, it sounds like the combination of his wife being diagnosed with cancer and being a father might have made him decide to slow down a bit. Plus, he did have two heart attacks, so there's that too. There was one humorous story (I forget on which episode) where Bruce says that he's not surprised people think he's been through rehab - his own brother (Dr.) Tom assumed he had been and was shocked when Bruce told him he hadn't.